Hi,
I'm using IndexReader.deleteDocuments(Term) to delete documents in batches. I
need the deleted count, so I cannot use IndexWriter.deleteDocuments().
What I want to do is delete documents based on more than one term, but not like
IndexWriter.deleteDocuments(Term[]) which deletes all documents with ANY term.
I want it to delete documents which have ALL terms, e.g.
Term("owner", "ownerUID") AND Term("subject", "something");
I have a new reader being used, so I could make a new IndexSearcher and query
the documents with all terms in a BooleanQuery and then iterate the results, but
that would either mean using the Hits mechanism or TopDocs and seems like a
heavyweight way to do things.
What I want to be able to do is to delete sequentially without storing up a
result set as I may want to delete all and ALL may be rather big.
I see the implementation uses reader.termDocs() to do the deletion for a single
Term, which of course is easy, but is there a simple way to make a deletion for
multiple terms with AND via the reader using, say termDocs, that will not
potentially use large amounts of memory, or should I just go with the searcher
TopDocs mechanism and do that also in batches to avoid the risk of a large
memory hit.
I know there's lots of clever 'expert-mode' stuff under the Lucene API hood, but
does anyone know any good way to do this or have I missed anything obvious in
the API docs?
Thanks
Antony
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